Distance-based paper microfluidic device for vitamin D quantification

Overview

The distance-based paper analytical device (dPAD) revolutionizes vitamin D detection by offering a low-cost, simple, and accurate solution suitable for home-testing and point-of-care diagnostics. Designed to operate without expensive instruments, power sources, or complex reagents, the dPAD translates a measurable distance signal from a color or fluorescent change into a vitamin D concentration. This innovative approach makes it highly accessible, particularly in resource-limited settings, and broadens its application to various biological samples including blood, saliva, and urine.

Technical specifications

The dPAD integrates several advanced materials to ensure high specificity and sensitivity. Key components include:

• Molecularly Imprinted Polymers (MIPs): These ensure precise recognition of vitamin D molecules, enhancing detection accuracy.
• Fluorescent Nanomaterials: Coated on the detection zone, they enable clear visual indication of vitamin D levels.
• Synthetic Hemostatic Agent: Facilitates on-device blood plasma separation, allowing the use of whole blood samples.
• Wax Printing Technique: Utilized for fabricating the microfluidic channels, ensuring ease of production and scalability. This combination of materials and techniques allows for a robust and reliable diagnostic tool that can be easily used by unskilled users.

Technology readiness level

Currently at Technology Readiness Level 4, the dPAD is in the fabrication stage with plans for performance evaluation and optimization. Following the fabrication process, which includes coating with fluorescent nanomaterials and MIPs, the device will undergo rigorous testing for linearity, detection limit, precision, selectivity, and accuracy across various sample types. The goal is to prepare the device for field trials and large-scale deployment based on trial outcomes and user feedback.